Telescopic sight for ordnance.



A. KGN 1G.-

TELESGOPIO SIGHT FOR ORDNANGE.

APPLICATION FILED 0013.6, 1908. 4

Patented Oct. 19, 1909.

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I M L ./b 1 v v \n Y UNITED s'rA'rns PATENT oration.

, ALBERT K6NIG, OF JEN A. GERMANY. ASSIGNOR TO FIRM F CARL ZEISS. OF JEN A.

' GERMANY.

TELESOOPIC SIGHT FOR OIRDNANCE.

Specificationof Letters Patent.

Patented itch-19. 1909.

' To all whom it may concern:

Be it. known that l. Anmcu'r Kiixic. a citizen of the German Enipirc, and residing at Carl-Zeiss strasse. Jena, in the Grand Duchy of Saxeeimar, Germany, have invented a new and useful Telescopic Sight for Ordnance, of which the following is a specification.

The object of the invention is a telescopic sight for ordnance smn'larto that of Patent 835,625. \Vitlrthe rotatable double sight tering the direction of his inspection through a greater angle. than 90 toward and 90 toward the left. According to the present improvement the sight is constructed with a triple telescopic svstem in order to reduce the rotation of the sight and hence the alteration of the direction of the vision to less than 90 on either side. In the triple telescopic system of the improved sight the three axes of the entering rays form three angles, of which each is less than 180. The three axes of the emerging rays coincide. The triple telescopic system contains two reflecting prisms as essential components, one prism being fixed and the other rotatable about its own axis of exit and both prisms having the same angle of deflection, which must lie between 90 and180". The objective of the telescopic system is arranged behind the rotatable prism, or else in front of it, but in the latter case always rigidly connected with it. The fixed prism is given a position, in which the principal plane of'reflection lies vertically, a vertical position, in such a manner above or below the rotatable one, that it lies in front of the rotatable prism, so that the order of reflection of the two prisms is alternate. when the rotatable prism is given its vertical position. In the latter case the telescope is directed forward. In the two horizontal positions of the rotatable prism, the fixed one takes no part,-a nd the telescope is in the one position directed toward the right and rear, in the other toward the left and the right rear. The erection oft-the image projected inverted by the objective can be obtained either wholly or in part by either of the two prisms, by the rotatable one in-all threetelescopes, by the fixed onein'the telescope (11- rected forward. If the rotatable prism be,

- sight.

' according to the invention. view of the-parts shown in Fig. 3.

Referring to the example'shown in Figs.-

constructed as a simple, ridge prism for completel erecting the-image, that is to say, be only provided with two'reflectmg surfaces which lie at an inclination of 90 to, one

another with their ridge in the principal section of the prism, the fixed prism, in order to obviate any alteration in the position of the image, should have one of the double reflecting forms in which the two reflecting surfaces lie one behind the other. If it be intended to give the three telescopes inspection' in a downward sloping direction. a simple reflecting prism of less than 90 de tiection may, in its vertical position, be combined with the ocular; A. simple reflecting rotatable prism then suffices -in both its horizontal positions to complete the erection of the image. In the. vertical position of the rotatable prism its effect upon the post tion of the image is annulled by the ocular. 'prlsm.

To completely erect the image in this telescope directed forward the fixed prism is therefore suitablyconstructed as a simple ridge prism.

In the annexed drawing: Figure 1 is a side view .partly in section of a telescopic sight constructed according to the invention. Fig. 2 is aback view of the same telescopic Fig; 3 is a side view of the optical parts ofa second telescopic sight constructed Fig. 4: is a back 1 and 2, the double reflectin fixed prism a is located below the ridge prism 12, the latter being rotatable about its ownaxis of emergence. .The rotatability of the prism 12 depends, in the example represented, upon the prism 6 being rigidly built in between the objective 0 and the ocular d, the casing e of which is rotatable about the ocular axis.

Three notches e" on the casing e, which stand 90 apart, secure, in combination-with'the spring catch the three positions of the easing e, name y, the one represented, which corresponds to the forward directed teleare suitable for all three positions of the easng e.

The fixed prism (1 belongs only to the telescope directed forward. It is fixed in the bearing of the telescope g", which forms one scope again represented, the other two hethe casing e.

for the entrance of the rays in the said posipiece with the s sale-disk g and is rotatably E mounted in the head h of the sight bar by means of a pivot 9 The head 72, carries 5 three lndices z'" 2" 2' one for each position of In the example shown in Figs. 3 and 4 the ocular (Z (Z equipped, for downward inspection, with the simple reflecting prism must remain in its vertical plane and may for this reason be housed in the same casing along ridge prism a. The objective 0 may be rigidly connected or not with the simple reflecting prism b rotatableabout the axis of the objective. The forward directed tele ing indicated in Fig. -.l by the horizontal'positions of the prism 7) shown in dotted lines.

I claim: 1. A gun sight for ordnance consisting of a telescopic system which comprises an objective. an ocular aml two reflecting prisms,

a carrier for this system, a base on which the carrier is mounted so as to be rotatable in a horizontal plane and means forindicating the angular position of the axis of entrance relatively to the base, both prisms having the same angle of deflection between and one being next the objective and rotatable about its own axis of exit and the other being fixed in the plane occupied by the first in its vertical position, so as to serve tion of the. first prism.

2. A gun slght for ordnance consisting of a telescopic system which comprises an obi jeetive, an ocular and two reflecting prisms, a carrier for this system, a base on which the carrier is mounted so as to be rotatable in a horiv'ontal plane and means for indicating the angular position of the axis of entrance relatively to the base, both prisms having the same angle of. deflection between 90 and 180, one being next following the objective and rigidly connected to it, both the ob- 7 i jectivc and this first prism being rotatable with the vertical thread a and the fixed:

about the axis of exit of the prism, the other prism being fixed in the plane occupied by the first. in its vertical position, so as to serve for the entrance of the rays in thesaid position of the first prism.

3. A gun sight. for ordnance consisting of a telescopic system which comprises an objective. an ocular and two reflecting prisms, a carrier for this system, a base on which the carrier is mounted so as to be rotatable in a horizontal plane and means for indicating th angular position of the axis of entrance rclati\'cl to the. base, both prisms having the same angle of deflection between 90 and 180, one of the prisms being a ridge prism nextthe objective and rotatable about its own axis of exit and the otherbeing a double reflecting prism fixed in the plane occupied ALBERT KoNIG.

\Vitneseses PAUL Kittie-ER, FRITZ SANDER.

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